Did any of the H's come from the factory with the cylinders overbored. I am getting ready to replace the rings and looking at the options available there are two options. 3 and 3/8 which is standard or 3 and 7/16 size which they are calling overbore. I measured the cylinder walls and it is 3 and 7/16. This tractor has been in my family since new and I don't remember it ever being rebuilt. It is a 1950 SN# FBH 329105 XI

the h uses dry sleeves in the engine. and iirc the 3 and 7/16 bore was the bore size used in the firepower kits which gave it a few more horses( the kit also came with parts to modify the governer and carb to work with the increased bore). as i have been told and read somewhere the firepower kits were available as a dealer installed option or the farmer could buy the kit and install it himself. hope this helps

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01 craftsman lt1000 15.5 b&s
amf 1414 gt k341 kohler
49' ferguson to-20
49 farmall H restoring it now and i'm not going to have it done for awhile i want it to be perfect

i'm not sure on what other parts were changed on the carbs and governers it more than likely was just a fuel metering setting on the carb that got changed but i'm not 100% on that only reason i know about the firepower kits at all is that a friend of mine in the used tractor business bought the inventory of a closed IH dealer and he has a pallet full of nos firepower kits for the a, c, and m. after seeing that i did some reading on the kits and know that they made one for the h he just didn't have one but i'm sure if you do an internet search on the kits you can find out what exactly was in them and what changes were made to the tractor aside from the obvious larger sleeves. from what i understand those nos kits are worth 800- 1000 to die-hard IH fans just for the originality. and you probably wouldn't notice much difference in power since at most it would only add something like 10hp but sometimes that is all the difference you need when it comes to getting the job done better.

__________________
01 craftsman lt1000 15.5 b&s
amf 1414 gt k341 kohler
49' ferguson to-20
49 farmall H restoring it now and i'm not going to have it done for awhile i want it to be perfect

Since you already have the big bore sleeves, have you looked at moving to high altitude pistons? I think the H could be equipped with 5000- and 8000-ft pistons, add some compression. Since even the cheap gas available now compares very favorably to the weak sauce the H was designed for, you shouldn't have any trouble with pinging. And the extra pop shows up on the drawbar.

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